(C) 648

Explanation

Width of walk is 6 ft., or \(6 \times 12=72\) in. Width of each brick is 4 in. Number of bricks that can be fitted along the width is \(72 \div 4 = 18\).

Length of walk is 24 ft., or \(24 \times 12=288\)in. Length of each brick is 8 in. Number of bricks that can be fitted along the length is \(288 \div 8=36\)

\(18 \times 36 = 648\)

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